A Solar type-II radio burst from CME-coronal ray interaction: simultaneous radio and EUV imaging

Thursday, 18 December 2014
Yao Chen1, Guohui Du1, Li Feng2, Shiwei Feng1, Xiangliang Kong1, Fan Guo3, Bing Wang1 and Gang Li4, (1)Shandong University at Weihai, Weihai, China, (2)Purple Mountain Observatory, Nanjing, China, (3)Los Alamos National Lab, Los Alamos, NM, United States, (4)University of Alabama in Huntsville, Huntsville, AL, United States
Simultaneous radio and extreme ultraviolet (EUV)/white-light imaging data are examined for a solar type II radio
burst occurring on 2010 March 18 to deduce its source location. Using a bow-shock model, we reconstruct the
three-dimensional EUV wave front (presumably the type-II-emitting shock) based on the imaging data of the two
Solar TErrestrial RElations Observatory spacecraft. It is then combined with the Nan¸cay radio imaging data to
infer the three-dimensional position of the type II source. It is found that the type II source coincides with the
interface between the coronal mass ejection (CME) EUV wave front and a nearby coronal ray structure, providing
evidence that the type II emission is physically related to the CME–ray interaction. This result, consistent with
those of previous studies, is based on simultaneous radio and EUV imaging data for the first time.